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1. ADMINISTRACINIO PASTATO ENERGIJOS VARTOJIMO EFEKTYVUMO SPRAGOS VERTINIMAS.

Author

DŽIUGAITĖ-TUMĖNIENĖ, Rasa and MADEIKIS, Domas

Subjects
*ENERGY consumption, *BAND gaps, *COOLING systems, *DYNAMIC simulation, *SIMULATION software, *HELIOSEISMOLOGY
Abstract

The high share of global energy costs to create an indoor climate has been of increasing interest to the global community for several decades and is increasingly the focus of policy. This paper analyses the energy performance gap between actual energy consumption and energy demand obtained during the dynamic energy simulation and building certification. To identify the energy performance gap, an existing office of energy efficiency class B was selected as a case study. The simulation program IDA Indoor Climate and Energy was used to create a dynamic energy model, based on the designed documentation and the actual indoor climate parameters recorded by the building management system. The results of the case study showed that the accuracy and reliability of the results presented by the dynamic energy model of the building directly depend on the assumptions. The correct values of the internal heat gains, indoor climate parameters, human behavior, air quality levels at different times of the day and season, HVAC system operation parameters and operation modes, specific fan powers of ventilation systems, the seasonal energy efficiency of cooling equipment and characteristics of sun protection measures have to be selected. [ABSTRACT FROM AUTHOR]

Published
2021
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2. 'EnergyPlus' programos panaudojimas pastatų energetiniam modeliavimui

Author

Sosnovskaja, Violeta, Juodis, Egidijus, Vaitiekūnas, Petras, Čiuprinskas, Kęstutis, Rynkun, Genrika, and Vilnius Gediminas Technical University

Subjects
Energy consumption, Pritaikymas, Administracinis pastatas, Energijos sąnaudos, Energy simulation, Office building, Kompiuterinis modeliavimas, Adaptibilyti, Power and Thermal Engineering
Abstract

Baigiamajame magistro darbe nagrinėjamos pastatų energijos vartojimo efektyvumo problemos. Ieškoma būdų, kaip galima būtų dar projektavimo arba renovacijos stadijoje sukurti energetiškai efektyvų pastatą naudojant naujoviškus metodus. Darbe atlikta literatūros, susijusios su kompiuteriniu energetiniu modeliavimu, analizė, atliktas kelių populiariausių energetinio modeliavimo programų palyginimas ir tolesniems skaičiavimams pasirinkta geriausia dinaminio modeliavimo programa – EnergyPlus. Buvo užsibrėžtas tikslas ištirti šios panaudojimo programos galimybes sprendžiant hipotetinio administracinės paskirties pastato modelį. Buvo užsibrėžti pagrindiniai uždaviniai – ištirti šio modelio šildymo/šaldymo galios priklausomybes per projektinę parą nuo įvairių faktorių. Sukūrus duomenų rinkmeną, aprašančią pastatą, buvo atliktas modeliavimas įvairiems įstiklinimo plotams, įvairioms pastato orientacijoms ir įvairioms stiklo rūšims. Buvo nustatyta atskirai šių faktorių įtaka pastato šildymo/šaldymo galiai. Tam, kad būtų galima įvertinti potencialų energijos sąnaudų sumažėjimą, kuris gali būti pasiektas taikant modeliavimą, buvo išanalizuotos dvi skirtingos to paties pastato modifikacijos: blogiausias ir geriausias variantas. Skirtumas tarp jų buvo gautas didelis, ypatingai potencialios šalčio santaupos. EnergyPlus apskaičiuota šildymo galia taip pat buvo palyginta su dviem kitomis paprastesnėmis skaičiavimo metodikomis. EnergyPlus paskaičiuota galia žymiai mažesnė, nei kitais dviem... [to full text] In this final Master paper were analyzed problems, related with buildings energy consumption and energy efficiency. For further analysis were chosen innovative tools – energy simulation programs, which help to save energy before building is built or renovated. After literature, related with building energy simulation, was analyzed, comparison of the most popular energy simulation programs was done. After this, EnergyPlus was chosen as the best dynamic energy simulation program. The main purpose of this paper – to investigate adaptability of the program in our applications. For investigation was chosen model of hypothetical office building. The main tasks were to calculate, how different factors influence building heating/cooling loads during design days. Main data file, describing building, was created and were made simulations for different cases of glazing, building orientations and glass types. After the influence of these factors was defined, for evaluating potential energy saving through energy simulation, was created the best and the worst case for the same building. Difference between cases was very big, especially in cooling loads. EnergyPlus calculation results were also compared with results of two simpler, often used heating power calculation methods. Heating power, calculated with EnergyPlus, was much smaller, than in other two cases. After all was made conclusion, that EergyPlus is adaptable in our appliances and, just through using dynamic energy simulation... [to full text]

Published
2005